Tiltable nut

Details Tiltable nut Tiltable nut

Category

A - Human Necessities

Subcategory

61

Subsubcategory

M

IPC codes

A61M 5/315 (2006.01) F16B 37/00 (2006.01)

Type

Patent

Patent number

CA 2311704

Description

In a syringe dosing mechanism a threaded spindle (1) and a nut (3) co-operates so that relative rotation thereof moves the nut (3) along the spindle (1). The nut (3) has two intersecting bores (12, 15). The first bore (15) has an inner thread (7) matching the outer thread (2) of the spindle (1) and the second bore (12) is smooth and fits slidingly over the spindle (1). The nut (3) is tiltable between a first and a second position. In the first position the threaded bore (15) is coaxial with the spindle (1) and in the second position the smooth bore (12) is coaxial with the spindle (1). The nut (3) is at a first side hinged to a piston rod (6)so that exertion of a force by the nut (3) on the piston rod (6) in a direction (10) by which an injection is performed will tilt said nut (3) into its first position. A piston withdrawal member acts at a second side of said nut diametrically opposite said first side so that the nut (3) is tilted to its second position when the withdrawal member applies a force (13) to said nut (3).

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